ML20126F253

Interim Part 21 Rept,Originally Reported on 810128,re Excessive Pressure Drops Across Essential Raw Cooling Water Sys Strainers.Evaluating Test Data to Determine Corrective Action.Next Rept to Be Submitted 810406

ML20126F253
Person / Time
Site:	Sequoyah
Issue date:	02/27/1981
From:	Mills L TENNESSEE VALLEY AUTHORITY
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
REF-PT21-81-373-000 10CFR-050.55E, 10CFR-50.55E, 1OCFR-50.55E, PT21-81-373, PT21-81-373-000, NUDOCS 8103120182
Download: ML20126F253 (3)

Text

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TENNESSEE VALLEY AUTHORITY

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CH ATTANOOGA, TENNESSEE 274o1 400 Chestnut Street Tower II TebruLry 27, 19E1 SQRD-50-328/81-17 I

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Mr. Jr.mes P.N.0'Reilly, Director Office of Ins'pection and Enforcement

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U.S. Nuclear Regulatory Commission Regicn II - Suite 3100 s

101 Itrietta Street Atlanta, Georgia 30{03

Dear Mr. O'Reilly:

SEQUDYAM NUOLEAR PLANT UNIT 2 - EXCESSIVE PFISSURE DROPS ACROSS THE ERCW STPaINERS - SQRD-50-328/81 FIRST II TEI:IM PZPORT i

The ::ubjcet deficiency was initially reported to !!RC-0IE Inspector E. W. Wright on January 28, 1961, in accordance with 10 CFR 50.55(e) as NCR SQi; ICS 8006R1. Enclosed is cur fir:t interin rep 0rt. We e::pcot to subcit our next report by April 6,1981. We consider 10 CPR 21 applicable to this deficiency.

4 If you have sny questions, ple.ase get in touch with D. L. Lambert at FTS E57-2551.

Very truly yours, j

i TENNESSCE VIJ LEY AUTHORITY

't L. M. Mills, Manager

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,Nuclear Regulation and Safety 1

Enclosure i

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It. Victor Stello, Directer (Enclosure) e

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Office of Inspection and Enforcement

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U.S. Nuclec.r Regulatory Co==ission r

Washington, DC 20555

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ENCLOSURE SECUDYAH' NUCLEAR PLANT UNIT 2 EXCESSIVE PRESSURE DROPS ACROSS THE ERCW STRAINERS SQRD-50-328/81-17 '

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10 CFR 50.55(e)

FIRST INTERIM REPORT Description of Deficiency During preoperational testing at Sequoyah unit 1, it was discovered that press'ure drops existed in excess of that designed for across the Essential' Raw Cooling Water System (ERCW) strainers.

S. P. Kinney Engineering in Carnegie, Pennsylvania, suppliec these strainers and predicted their pressure drop. The actual pressure drop was much larger than the stated value. As a result, reduced flow rates could coeur dve to increased syste:

resistance. The total system pressure drop for unit 1 has been determined to be acceptable; however, the acceptability cf two-unit operation has not yet been established.

Interit Progrees TVA is evaluating preoperational test data for unit 2 operation of the ERCW's to determine what corrective action, if ar.y, will be necessary.

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